A man stands at a distance of $68 m$ from a cliff and fires a gun. After what time interval will be hear the echo, if the speed in air is $340 m s^{- 1} ?$

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Solution

Step 1. Given
Distance between man and cliff $= 68 m .$
Speed of sound is $340 m / s$
Step 2. Finding the time taken by the sound
$T i m e$ $=$ $\frac{T o t a l t r a v e l d i s \tan c e b y s o u n d}{s p e e d o f s o u n d .}$
Sound travel from man to cliff and cliff to man is $= 2 \times 68$
$= 136 m$
By using the formula of the time
$∴ T i m e t a k e n b y s o u n d = \frac{136}{340}$ $= 0.4 s$
Hence, the time taken by the sound $= 0.4 s$

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A man stands at a distance of 68m from a cliff and fires a gun. After what time interval will be hear the echo, if the speed in air is 340ms-1?

A man stands at a distance of $68 m$ from a cliff and fires a gun. After what time interval will be hear the echo, if the speed in air is $340 m s^{- 1} ?$